1. Department of Chemistry, Fu-Jen Catholic University, New Taipei City 24205, Taiwan, ROC
2. Instruments Center and Department of Chemistry, National Chung-Hsing University, Taichung 402, Taiwan, ROC
3. Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan, ROC
4. Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States